No, the Redmi Y2 does not support 5G. 5G is not available in India and none of the devices support 5G as of now. The first deployments of 5G are in Qatar, US, UK and Spain. There is still sometime before the 5G spectrum is launched in India.
I will recommend you Redmi Note 5 Pro, it comes with a better GPU i.e. Adreno 509 and 6GB RAM. It comes with a bigger 4000 mAh battery and the device sports a 5.99-inch IPS LCD full HD display which exhibits an excellent pixel density of 403 PPI. It is equipped with a wide range of strong features. The configuration is powerful to ensure a lag-free performance to handle multiple applications.
Mi is very good Smartphone company it gives us very good specifications in cheap price I recommend to u MiA2 because this is very good Smartphone better than Redmi S2 Redmi note 5 pro Asus Zenfone max pro this is not in India so second choice in Redmi note 5 pro